<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    body > div:nth-child(1) {
        /*position: relative;*/
    }

    body > div:nth-child(1) > div:nth-child(1) {
        display: flex;
    }

    body > div:nth-child(1) > div:nth-child(1) > div {
        /*border: 1px solid red;*/
        margin: 10px;
    }

    body > div:nth-child(1) > div:nth-child(1) > div > div:nth-child(1) {
        background-color: #0000FF;
        cursor: pointer;
    }

    .er {
        visibility: hidden;
        /*display: none;*/
        /*background-color: #00FF00;*/
        background-color: rgba(0, 255, 0, 100);
        z-index: auto;
    }

    .er > div {
        cursor: pointer;
        width: 100px;
        text-align: center;
    }

    .er > div:hover {
        background-color: #75bb33;
    }

    body > div:nth-child(1) > div:nth-child(2) {
        margin-top: -70px;
        /*margin: 10px;*/
        position: relative;
        z-index: -999;
        /*top: 30px;*/
        height: 200px;
        background-size: 100% 100%;
        width: 200px;
        background-color: #7b4397;
        /*background-image: url("../upload/1670899546998--11_bo39.jpg");*/
    }

    body > div:nth-child(1) > div:nth-child(1) > div:hover .er {
        /*display: block;*/
        visibility: visible;
    }
</style>
<body>
<div>
    <div>
        <div>
            <div>衣服</div>
            <div class="er">
                <div>T恤</div>
                <div>衬衫</div>
                <div>夹克</div>
            </div>
        </div>
        <div>
            <div>裤子</div>
            <div class="er">
                <div>喇叭裤</div>
                <div>七分裤</div>
                <div>内裤</div>
            </div>
        </div>
        <div>
            <div>鞋子</div>
            <div class="er">
                <div>马丁靴</div>
                <div>胶鞋</div>
                <div>运动鞋</div>
            </div>
        </div>
    </div>
    <div>发射点发射点发</div>
</div>
<div>
    fasdfasd
</div>
</body>
</html>